An Observational Study of the Frequency, Severity, and Etiology of Failures in Postoperative Care After Major Elective General Surgery Symons, Nicholas R. A.; Almoudaris, Alex M.; Nagpal, Kamal; More Symons, Nicholas R. A.; Almoudaris, Alex M.; Nagpal, Kamal; Vincent, Charles A.; Moorthy, Krishna Less Annals of Surgery. 257(1):1-5, January 2013. Abstract Abstract In Brief In Brief Favorites PDF Get Content & Permissions Abstract: In Brief: Adverse events are common and are frequently caused by failures in the process of care. Fifty postsurgical patients were observed for 659 days. A total of 256 process failures were identified, of which 85% were preventable and 51% led directly to patient harm. Process failures accounted for 57% of preventable adverse events.